I've done this in the past using a method similar to this: http://javascriptkit.com/javatutors/static3.shtml
but I don't like the "flicker" effect as the page is scrolled and the div needs to move with the scrolling. Lately I've seen a lot of site that have an element (a div or the like I presume) that don't move when the page is scrolled but it's seemless...they're just there and it's a beautiful thing.
Unfortunately I can't seem to recall where I've seen it lately to view the source and try to figure it out so I figured I'd turn here and see what all of you experts can provide as far as assistance / suggestions.
TIA